Electric attachment plug cap



June 12, 192s; 1,673,756 L. H. MOULTHROP ELECTRIC ,ATTACHMENT PLUG GAP Filed May 11, 19'25 noamtoz 5M his @www lPatented June 12, 1928.

UNITED iS'lHlSl`IE1S PATENT OFFlCE.

LEMBERT H. MOULTHROP, OF SOUTH NORWALK, UONNECTICUT.

ELECTRIC ATTACHMENT T'LUG UA1?.

.Application tiled May 11,

This .invention relates to electric attachment plugl and particularly to the cap portion of' separable plugs ot this character. In connecting` electrical conductors to conl? tact terminals of attachment plug,` caps it is customary to knot the conductors within the plugl so that the strain of the weight ot an electric translating device such as a lamp or electric aliparatus, or from a pull on the 10 conductor to separate the plug' will come on the li'not and not on the connections between the conductors and terminals within the plug and. thus breaking;4 the connections. The luotting oi the conductors tends to breal-i the insulation oit the conductors causing a short circuit and possibly a tire.

It is the object of the invention to overcome the above disadvantages in plug` caps ot this character by arrangi'ni` strain receivingrr mea us for the electric current conductors within the cap about which the conductors are adapted to be enga-ged and 'talre any strain upon the conductors and relieve the connections oit the conductors with the plug 25 tern'iinals `from the strain. Another object oit the invention is to provide an electric attachment plug' cap ot this character ot integral struct-nre which is compact and cheap to manufacture.

ln the drawing accompanying and `torm- .ing a part et this speciiication. I have shown an embodiment el' the invention, in which .Figure 1 is an elevational view ot the attaeament plug cap,

Figure il is an end view of the plus; cap showing an opening through which electrical conductors are passed.

Figure 3 is a sectional view taken on line ot Figure 5 looking in the direction of 'the arrows. showingl strain receiving means in relation to the opening.

Figure 1lis a sectional view taken on line -l-sl ot Figure 5 looking;` in the direction ot the arrows and showing the strain receivinf' .nfieans and the manner ot mounting contact terminals on the plug.

Figure 5 is view looking at the top oit Figure 4.

Figure 6 is a view similar to Figure 5 but 5o showing the electric conductors in connection with Contact terminals, and

Figure i' is a sectional view taken on line i--T ot ll'ieure looking in tbe direction oit? `vond the end of the lugs.

1925. serial No. 29,357.

Similar characters of reference designate like )arts throughout the different views of the drawing.

The embodiment of the invention illustrate'd in the drawing comprises a cap 7 of moulded insulating` material in the form of a shell el' circular shape with an' opening 8 at the apen. rThe interior ot the cap Ais provided with two opposite parallel lugs 9 intenral. with the wall ol.2 the cap and terminatinf;- within the cap as at 10 with the opposite sides 1.1 ot the lugs arranged 'in arcs of a circle to torm opposite extended wall portions ot the opening` 8 to facilitate the pas olE electric conductors 12 entered through the opening` 8. The gap between the lugs is spanned'by a bridge piece 13 which extends transversely ot and in spaced relation to the openingT 8 and the bottom wall ot the bridge piece beingof V-shape7 as shown at lll, the opening*l S leading into the cap at opposite sides of said bridge piece as clearly shown in Figure 3. A lug 19 is arranged midway between the ends of the bridge piece to extend transversely andout ward therefrom.

The ends oit the lugs 9 are in the nature ol seats for mounting' 'contact terminals shown as blades 15 extending parallel to each other and the axis ot the cap. Each oi said contact blades has a laterally bent end 16 iter engagement with the ends of the lugs a. rllhese contact terminals are mounted upon the cap by means ott bushings 17 (Figure 7) mouldedin the .material of the cap lugs 9 with a portion projectingr be- Y To attach the contact blades 15 to thecap the projected ends ot the bushings are inserted in per felations in portions extendingr laterally and oppositely from the blade extension 16 and the lnishingv ends crimped or riveted over said blade extension. as shown at 18 in Fig. ure 7. i

In connect/ing the conductors 12 to the contact terminals 15 the en'ds ot the conductors are passed through the opening .8, one beine; directed to each side or the bridge piece` this being` facilitated by arranging the bottom wall 14- 'of V-shape. The con ductors are then engaged over the bridge piece, to engage between the bridge lug* 19 a" d Contact blades 15, and then 'bared ends bent- :iroinid tin; contact blades, as at Q05 tion therewith at the outer sides whereby strains on the conductors are adapted to be tellen up by the bridge piece.

7. A oep ineinber Afor separable` electric connection plugs embodying it substantially 10 extending lug intermediate the ends thereof and an opening centrally through the crown wall of the shell, and Contact terminal mounting members molded into the material of the cap at opposite ends of the bridge piece.

Signed at the city of New York, in the eountg7 of New-York and State of New York this lst day of May, 1925.

LEMBERT H. MOULTHROP. 

